>  The Lionel website says the hopper is an ACF model. Isn't that
what
> PRS--SSA produce?
> 
The original ACF
CenterFlow cars were a cylindrical design, very different from the later
PRS model. 
The ACF cylindrical is much  more similar to the Kaslo
model of a Canadian-built NSC car, though it is a different
prototype.
Information on the subject from
Lionel:
http://lionelllc.wordpress.com/2011/10/14/freight-car-friday-covered-hoppers/
Stan
Stokrocki

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